feat: initial plan

pkg/format/keywords.go

@@ -0,0 +1,55 @@
+package format
+
+// keywords are SQL / PL/pgSQL words the formatter may re-case via KeywordCase.
+// Type-name words are deliberately excluded (see typeNames) so the house style
+// can keep types lowercase while keywords are uppercased.
+var keywords = words(`
+add after all alter analyze and any array as asc atomic begin between by
+called cascade case cast check close coalesce collate column commit
+concurrently constraint create cross cube current_date current_time
+current_timestamp current_user cursor declare default deferrable definer delete desc
+distinct do drop each else elsif end except exception execute exists external
+fetch filter first for foreach foreign from full function get grant group
+grouping having if ilike immutable in index inner inout insert intersect into
+into invoker is join key language last leakproof left like limit localtime
+localtimestamp loop materialized natural new next no not nothing notify null
+nulls of off offset old on only open or order out outer over overriding
+parallel partition perform precision primary procedure raise
+references refresh rename replace reset restrict return returning returns
+revoke right rollback row rows safe schema secdef security select sequence set
+setof some stable stacked strict table temp temporary then to transaction
+trigger truncate union unique unsafe update using vacuum values variadic view
+volatile when where while window with within
+`)
+
+// typeNames are built-in/common type words kept lowercase by the house style.
+var typeNames = words(`
+bigint bigserial bit bool boolean box bytea char character cidr circle citext
+date daterange decimal double float float4 float8 hstore inet int int2 int4
+int8 integer interval json jsonb line lseg macaddr macaddr8 money numeric oid
+path pg_lsn point polygon real serial serial2 serial4 serial8 smallint
+smallserial text time timestamp timestamptz timetz tsquery tsrange tstzrange
+tsvector uuid varbit varchar xml
+`)
+
+func words(s string) map[string]bool {
+	m := make(map[string]bool)
+	w := ""
+	for _, r := range s {
+		if r == ' ' || r == '\n' || r == '\t' || r == '\r' {
+			if w != "" {
+				m[w] = true
+				w = ""
+			}
+			continue
+		}
+		w += string(r)
+	}
+	if w != "" {
+		m[w] = true
+	}
+	return m
+}
+
+func isKeyword(lower string) bool  { return keywords[lower] }
+func isTypeName(lower string) bool { return typeNames[lower] }